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Finding the Fourth Proportional to 128,354.38, 177,113.64 and 70,985.91

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Solution

The fourth proportional to 128,354.38, 177,113.64 and 70,985.91 is: 97,952.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,354.38 : 177,113.64 = 70,985.91 : x
  2. Step 2: Convert to fraction form
    128,354.38/177,113.64 = 70,985.91/x
  3. Step 3: Cross multiply
    128,354.38x = 177,113.64 × 70,985.91
  4. Step 4: Simplify right side
    128,354.38x = 12,572,572,908.81
  5. Step 5: Solve for x
    x = 12,572,572,908.81/128,354.38
  6. Step 6: Final answer
    x = 97,952.04

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.