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Finding the Fourth Proportional to 129,457.49, 178,345.03 and 123,478.47

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Solution

The fourth proportional to 129,457.49, 178,345.03 and 123,478.47 is: 170,108.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,457.49 : 178,345.03 = 123,478.47 : x
  2. Step 2: Convert to fraction form
    129,457.49/178,345.03 = 123,478.47/x
  3. Step 3: Cross multiply
    129,457.49x = 178,345.03 × 123,478.47
  4. Step 4: Simplify right side
    129,457.49x = 22,021,771,882.37
  5. Step 5: Solve for x
    x = 22,021,771,882.37/129,457.49
  6. Step 6: Final answer
    x = 170,108.14

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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.