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Finding the Fourth Proportional to 715,922.92, 987,915 and 421,526.08

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Solution

The fourth proportional to 715,922.92, 987,915 and 421,526.08 is: 581,671.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,922.92 : 987,915 = 421,526.08 : x
  2. Step 2: Convert to fraction form
    715,922.92/987,915 = 421,526.08/x
  3. Step 3: Cross multiply
    715,922.92x = 987,915 × 421,526.08
  4. Step 4: Simplify right side
    715,922.92x = 416,431,937,323.20
  5. Step 5: Solve for x
    x = 416,431,937,323.20/715,922.92
  6. Step 6: Final answer
    x = 581,671.47

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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.