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Finding the Fourth Proportional to 128,126.72, 176,985.60 and 103,070.72

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Solution

The fourth proportional to 128,126.72, 176,985.60 and 103,070.72 is: 142,374.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,126.72 : 176,985.60 = 103,070.72 : x
  2. Step 2: Convert to fraction form
    128,126.72/176,985.60 = 103,070.72/x
  3. Step 3: Cross multiply
    128,126.72x = 176,985.60 × 103,070.72
  4. Step 4: Simplify right side
    128,126.72x = 18,242,033,221.63
  5. Step 5: Solve for x
    x = 18,242,033,221.63/128,126.72
  6. Step 6: Final answer
    x = 142,374.93

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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.