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Finding the Fourth Proportional to 85,909.51, 128,693.00 and 67,101.51

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Solution

The fourth proportional to 85,909.51, 128,693.00 and 67,101.51 is: 100,518.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,909.51 : 128,693.00 = 67,101.51 : x
  2. Step 2: Convert to fraction form
    85,909.51/128,693.00 = 67,101.51/x
  3. Step 3: Cross multiply
    85,909.51x = 128,693.00 × 67,101.51
  4. Step 4: Simplify right side
    85,909.51x = 8,635,495,276.78
  5. Step 5: Solve for x
    x = 8,635,495,276.78/85,909.51
  6. Step 6: Final answer
    x = 100,518.50

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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.