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Finding the Fourth Proportional to 665,989.80, 998,984.70 and 292,012.80

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Solution

The fourth proportional to 665,989.80, 998,984.70 and 292,012.80 is: 438,019.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,989.80 : 998,984.70 = 292,012.80 : x
  2. Step 2: Convert to fraction form
    665,989.80/998,984.70 = 292,012.80/x
  3. Step 3: Cross multiply
    665,989.80x = 998,984.70 × 292,012.80
  4. Step 4: Simplify right side
    665,989.80x = 291,716,319,404.16
  5. Step 5: Solve for x
    x = 291,716,319,404.16/665,989.80
  6. Step 6: Final answer
    x = 438,019.20

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Double scale
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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.