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Finding the Fourth Proportional to 128,347.50, 177,115.32 and 70,985.91

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Solution

The fourth proportional to 128,347.50, 177,115.32 and 70,985.91 is: 97,958.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,347.50 : 177,115.32 = 70,985.91 : x
  2. Step 2: Convert to fraction form
    128,347.50/177,115.32 = 70,985.91/x
  3. Step 3: Cross multiply
    128,347.50x = 177,115.32 × 70,985.91
  4. Step 4: Simplify right side
    128,347.50x = 12,572,692,165.14
  5. Step 5: Solve for x
    x = 12,572,692,165.14/128,347.50
  6. Step 6: Final answer
    x = 97,958.22

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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.