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Finding the Fourth Proportional to 620,880.60, 931,320.90 and 515,904.60

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Solution

The fourth proportional to 620,880.60, 931,320.90 and 515,904.60 is: 773,856.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,880.60 : 931,320.90 = 515,904.60 : x
  2. Step 2: Convert to fraction form
    620,880.60/931,320.90 = 515,904.60/x
  3. Step 3: Cross multiply
    620,880.60x = 931,320.90 × 515,904.60
  4. Step 4: Simplify right side
    620,880.60x = 480,472,736,386.14
  5. Step 5: Solve for x
    x = 480,472,736,386.14/620,880.60
  6. Step 6: Final answer
    x = 773,856.90

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.