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Finding the Fourth Proportional to 191,708.40, 287,346.60 and 91,916.40

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Solution

The fourth proportional to 191,708.40, 287,346.60 and 91,916.40 is: 137,771.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,708.40 : 287,346.60 = 91,916.40 : x
  2. Step 2: Convert to fraction form
    191,708.40/287,346.60 = 91,916.40/x
  3. Step 3: Cross multiply
    191,708.40x = 287,346.60 × 91,916.40
  4. Step 4: Simplify right side
    191,708.40x = 26,411,865,024.24
  5. Step 5: Solve for x
    x = 26,411,865,024.24/191,708.40
  6. Step 6: Final answer
    x = 137,771.04

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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.