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Finding the Fourth Proportional to 128,567.61, 177,258.44 and 99,838.53

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Solution

The fourth proportional to 128,567.61, 177,258.44 and 99,838.53 is: 137,649.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,567.61 : 177,258.44 = 99,838.53 : x
  2. Step 2: Convert to fraction form
    128,567.61/177,258.44 = 99,838.53/x
  3. Step 3: Cross multiply
    128,567.61x = 177,258.44 × 99,838.53
  4. Step 4: Simplify right side
    128,567.61x = 17,697,221,580.50
  5. Step 5: Solve for x
    x = 17,697,221,580.50/128,567.61
  6. Step 6: Final answer
    x = 137,649.14

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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.