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Finding the Fourth Proportional to 108,530.40, 162,478.80 and 77,426.40

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Solution

The fourth proportional to 108,530.40, 162,478.80 and 77,426.40 is: 115,913.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,530.40 : 162,478.80 = 77,426.40 : x
  2. Step 2: Convert to fraction form
    108,530.40/162,478.80 = 77,426.40/x
  3. Step 3: Cross multiply
    108,530.40x = 162,478.80 × 77,426.40
  4. Step 4: Simplify right side
    108,530.40x = 12,580,148,560.32
  5. Step 5: Solve for x
    x = 12,580,148,560.32/108,530.40
  6. Step 6: Final answer
    x = 115,913.59

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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.