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Finding the Fourth Proportional to 665,653.60, 998,480.40 and 385,890.40

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Solution

The fourth proportional to 665,653.60, 998,480.40 and 385,890.40 is: 578,835.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,653.60 : 998,480.40 = 385,890.40 : x
  2. Step 2: Convert to fraction form
    665,653.60/998,480.40 = 385,890.40/x
  3. Step 3: Cross multiply
    665,653.60x = 998,480.40 × 385,890.40
  4. Step 4: Simplify right side
    665,653.60x = 385,304,000,948.16
  5. Step 5: Solve for x
    x = 385,304,000,948.16/665,653.60
  6. Step 6: Final answer
    x = 578,835.60

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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.