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Finding the Fourth Proportional to 715,688.40, 987,638.91 and 393,391.58

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Solution

The fourth proportional to 715,688.40, 987,638.91 and 393,391.58 is: 542,874.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,688.40 : 987,638.91 = 393,391.58 : x
  2. Step 2: Convert to fraction form
    715,688.40/987,638.91 = 393,391.58/x
  3. Step 3: Cross multiply
    715,688.40x = 987,638.91 × 393,391.58
  4. Step 4: Simplify right side
    715,688.40x = 388,528,826,336.18
  5. Step 5: Solve for x
    x = 388,528,826,336.18/715,688.40
  6. Step 6: Final answer
    x = 542,874.28

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.