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Finding the Fourth Proportional to 620,428.80, 930,643.20 and 557,443.20

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Solution

The fourth proportional to 620,428.80, 930,643.20 and 557,443.20 is: 836,164.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,428.80 : 930,643.20 = 557,443.20 : x
  2. Step 2: Convert to fraction form
    620,428.80/930,643.20 = 557,443.20/x
  3. Step 3: Cross multiply
    620,428.80x = 930,643.20 × 557,443.20
  4. Step 4: Simplify right side
    620,428.80x = 518,780,723,466.24
  5. Step 5: Solve for x
    x = 518,780,723,466.24/620,428.80
  6. Step 6: Final answer
    x = 836,164.80

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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.