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Finding the Fourth Proportional to 86,830.90, 130,246.35 and 85,909.30

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Solution

The fourth proportional to 86,830.90, 130,246.35 and 85,909.30 is: 128,863.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,830.90 : 130,246.35 = 85,909.30 : x
  2. Step 2: Convert to fraction form
    86,830.90/130,246.35 = 85,909.30/x
  3. Step 3: Cross multiply
    86,830.90x = 130,246.35 × 85,909.30
  4. Step 4: Simplify right side
    86,830.90x = 11,189,372,756.06
  5. Step 5: Solve for x
    x = 11,189,372,756.06/86,830.90
  6. Step 6: Final answer
    x = 128,863.95

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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.