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Finding the Fourth Proportional to 663,448.14, 915,270.12 and 421,601.22

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Solution

The fourth proportional to 663,448.14, 915,270.12 and 421,601.22 is: 581,626.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,448.14 : 915,270.12 = 421,601.22 : x
  2. Step 2: Convert to fraction form
    663,448.14/915,270.12 = 421,601.22/x
  3. Step 3: Cross multiply
    663,448.14x = 915,270.12 × 421,601.22
  4. Step 4: Simplify right side
    663,448.14x = 385,878,999,221.55
  5. Step 5: Solve for x
    x = 385,878,999,221.55/663,448.14
  6. Step 6: Final answer
    x = 581,626.47

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Double scale
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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.