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Finding the Fourth Proportional to 86,815.60, 130,309.80 and 42,492.40

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Solution

The fourth proportional to 86,815.60, 130,309.80 and 42,492.40 is: 63,780.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,815.60 : 130,309.80 = 42,492.40 : x
  2. Step 2: Convert to fraction form
    86,815.60/130,309.80 = 42,492.40/x
  3. Step 3: Cross multiply
    86,815.60x = 130,309.80 × 42,492.40
  4. Step 4: Simplify right side
    86,815.60x = 5,537,176,145.52
  5. Step 5: Solve for x
    x = 5,537,176,145.52/86,815.60
  6. Step 6: Final answer
    x = 63,780.89

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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.