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Finding the Fourth Proportional to 559,136.39, 771,640.65 and 421,068.15

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Solution

The fourth proportional to 559,136.39, 771,640.65 and 421,068.15 is: 581,098.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    559,136.39 : 771,640.65 = 421,068.15 : x
  2. Step 2: Convert to fraction form
    559,136.39/771,640.65 = 421,068.15/x
  3. Step 3: Cross multiply
    559,136.39x = 771,640.65 × 421,068.15
  4. Step 4: Simplify right side
    559,136.39x = 324,913,300,960.30
  5. Step 5: Solve for x
    x = 324,913,300,960.30/559,136.39
  6. Step 6: Final answer
    x = 581,098.47

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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.