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Finding the Fourth Proportional to 621,007.20, 931,510.80 and 432,050.40

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Solution

The fourth proportional to 621,007.20, 931,510.80 and 432,050.40 is: 648,075.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,007.20 : 931,510.80 = 432,050.40 : x
  2. Step 2: Convert to fraction form
    621,007.20/931,510.80 = 432,050.40/x
  3. Step 3: Cross multiply
    621,007.20x = 931,510.80 × 432,050.40
  4. Step 4: Simplify right side
    621,007.20x = 402,459,613,744.32
  5. Step 5: Solve for x
    x = 402,459,613,744.32/621,007.20
  6. Step 6: Final answer
    x = 648,075.60

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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.