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Finding the Fourth Proportional to 86,547.60, 129,821.40 and 81,298.80

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Solution

The fourth proportional to 86,547.60, 129,821.40 and 81,298.80 is: 121,948.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,547.60 : 129,821.40 = 81,298.80 : x
  2. Step 2: Convert to fraction form
    86,547.60/129,821.40 = 81,298.80/x
  3. Step 3: Cross multiply
    86,547.60x = 129,821.40 × 81,298.80
  4. Step 4: Simplify right side
    86,547.60x = 10,554,324,034.32
  5. Step 5: Solve for x
    x = 10,554,324,034.32/86,547.60
  6. Step 6: Final answer
    x = 121,948.20

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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.