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Finding the Fourth Proportional to 715,840, 987,834.02 and 393,547.76

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Solution

The fourth proportional to 715,840, 987,834.02 and 393,547.76 is: 543,082.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,840 : 987,834.02 = 393,547.76 : x
  2. Step 2: Convert to fraction form
    715,840/987,834.02 = 393,547.76/x
  3. Step 3: Cross multiply
    715,840x = 987,834.02 × 393,547.76
  4. Step 4: Simplify right side
    715,840x = 388,759,865,822.80
  5. Step 5: Solve for x
    x = 388,759,865,822.80/715,840
  6. Step 6: Final answer
    x = 543,082.07

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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.