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Finding the Fourth Proportional to 415,421.32, 623,131.98 and 99,878.22

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Solution

The fourth proportional to 415,421.32, 623,131.98 and 99,878.22 is: 149,817.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    415,421.32 : 623,131.98 = 99,878.22 : x
  2. Step 2: Convert to fraction form
    415,421.32/623,131.98 = 99,878.22/x
  3. Step 3: Cross multiply
    415,421.32x = 623,131.98 × 99,878.22
  4. Step 4: Simplify right side
    415,421.32x = 62,237,312,987.48
  5. Step 5: Solve for x
    x = 62,237,312,987.48/415,421.32
  6. Step 6: Final answer
    x = 149,817.33

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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.