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Finding the Fourth Proportional to 663,278.25, 915,471.72 and 421,513.68

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Solution

The fourth proportional to 663,278.25, 915,471.72 and 421,513.68 is: 581,782.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,278.25 : 915,471.72 = 421,513.68 : x
  2. Step 2: Convert to fraction form
    663,278.25/915,471.72 = 421,513.68/x
  3. Step 3: Cross multiply
    663,278.25x = 915,471.72 × 421,513.68
  4. Step 4: Simplify right side
    663,278.25x = 385,883,853,633.13
  5. Step 5: Solve for x
    x = 385,883,853,633.13/663,278.25
  6. Step 6: Final answer
    x = 581,782.76

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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.