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Finding the Fourth Proportional to 86,646.30, 129,969.45 and 39,990.30

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Solution

The fourth proportional to 86,646.30, 129,969.45 and 39,990.30 is: 59,985.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,646.30 : 129,969.45 = 39,990.30 : x
  2. Step 2: Convert to fraction form
    86,646.30/129,969.45 = 39,990.30/x
  3. Step 3: Cross multiply
    86,646.30x = 129,969.45 × 39,990.30
  4. Step 4: Simplify right side
    86,646.30x = 5,197,517,296.34
  5. Step 5: Solve for x
    x = 5,197,517,296.34/86,646.30
  6. Step 6: Final answer
    x = 59,985.45

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Double scale
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Similar ratio
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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.