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Finding the Fourth Proportional to 658,013.60, 987,020.40 and 421,817.60

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Solution

The fourth proportional to 658,013.60, 987,020.40 and 421,817.60 is: 632,726.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    658,013.60 : 987,020.40 = 421,817.60 : x
  2. Step 2: Convert to fraction form
    658,013.60/987,020.40 = 421,817.60/x
  3. Step 3: Cross multiply
    658,013.60x = 987,020.40 × 421,817.60
  4. Step 4: Simplify right side
    658,013.60x = 416,342,576,279.04
  5. Step 5: Solve for x
    x = 416,342,576,279.04/658,013.60
  6. Step 6: Final answer
    x = 632,726.40

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.