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Finding the Fourth Proportional to 90,104.40, 134,719.20 and 66,484.80

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Solution

The fourth proportional to 90,104.40, 134,719.20 and 66,484.80 is: 99,404.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,104.40 : 134,719.20 = 66,484.80 : x
  2. Step 2: Convert to fraction form
    90,104.40/134,719.20 = 66,484.80/x
  3. Step 3: Cross multiply
    90,104.40x = 134,719.20 × 66,484.80
  4. Step 4: Simplify right side
    90,104.40x = 8,956,779,068.16
  5. Step 5: Solve for x
    x = 8,956,779,068.16/90,104.40
  6. Step 6: Final answer
    x = 99,404.46

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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.