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Finding the Fourth Proportional to 128,612.88, 177,547.38 and 85,663.84

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Solution

The fourth proportional to 128,612.88, 177,547.38 and 85,663.84 is: 118,257.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,612.88 : 177,547.38 = 85,663.84 : x
  2. Step 2: Convert to fraction form
    128,612.88/177,547.38 = 85,663.84/x
  3. Step 3: Cross multiply
    128,612.88x = 177,547.38 × 85,663.84
  4. Step 4: Simplify right side
    128,612.88x = 15,209,390,352.74
  5. Step 5: Solve for x
    x = 15,209,390,352.74/128,612.88
  6. Step 6: Final answer
    x = 118,257.13

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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.