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Finding the Fourth Proportional to 520,088.40, 780,132.60 and 319,759.20

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Solution

The fourth proportional to 520,088.40, 780,132.60 and 319,759.20 is: 479,638.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,088.40 : 780,132.60 = 319,759.20 : x
  2. Step 2: Convert to fraction form
    520,088.40/780,132.60 = 319,759.20/x
  3. Step 3: Cross multiply
    520,088.40x = 780,132.60 × 319,759.20
  4. Step 4: Simplify right side
    520,088.40x = 249,454,576,069.92
  5. Step 5: Solve for x
    x = 249,454,576,069.92/520,088.40
  6. Step 6: Final answer
    x = 479,638.80

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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.