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Finding the Fourth Proportional to 129,090.80, 193,547.40 and 65,788.40

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Solution

The fourth proportional to 129,090.80, 193,547.40 and 65,788.40 is: 98,637.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,090.80 : 193,547.40 = 65,788.40 : x
  2. Step 2: Convert to fraction form
    129,090.80/193,547.40 = 65,788.40/x
  3. Step 3: Cross multiply
    129,090.80x = 193,547.40 × 65,788.40
  4. Step 4: Simplify right side
    129,090.80x = 12,733,173,770.16
  5. Step 5: Solve for x
    x = 12,733,173,770.16/129,090.80
  6. Step 6: Final answer
    x = 98,637.34

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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.