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Finding the Fourth Proportional to 85,978.20, 128,967.30 and 66,295.20

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Solution

The fourth proportional to 85,978.20, 128,967.30 and 66,295.20 is: 99,442.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,978.20 : 128,967.30 = 66,295.20 : x
  2. Step 2: Convert to fraction form
    85,978.20/128,967.30 = 66,295.20/x
  3. Step 3: Cross multiply
    85,978.20x = 128,967.30 × 66,295.20
  4. Step 4: Simplify right side
    85,978.20x = 8,549,912,946.96
  5. Step 5: Solve for x
    x = 8,549,912,946.96/85,978.20
  6. Step 6: Final answer
    x = 99,442.80

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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.