Home / 90,905.16-136,379.28-28,575.72

Finding the Fourth Proportional to 90,905.16, 136,379.28 and 28,575.72

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Solution

The fourth proportional to 90,905.16, 136,379.28 and 28,575.72 is: 42,870.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,905.16 : 136,379.28 = 28,575.72 : x
  2. Step 2: Convert to fraction form
    90,905.16/136,379.28 = 28,575.72/x
  3. Step 3: Cross multiply
    90,905.16x = 136,379.28 × 28,575.72
  4. Step 4: Simplify right side
    90,905.16x = 3,897,136,119.08
  5. Step 5: Solve for x
    x = 3,897,136,119.08/90,905.16
  6. Step 6: Final answer
    x = 42,870.35

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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.