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Finding the Fourth Proportional to 128,563.61, 177,417.77 and 78,262.61

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Solution

The fourth proportional to 128,563.61, 177,417.77 and 78,262.61 is: 108,002.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,563.61 : 177,417.77 = 78,262.61 : x
  2. Step 2: Convert to fraction form
    128,563.61/177,417.77 = 78,262.61/x
  3. Step 3: Cross multiply
    128,563.61x = 177,417.77 × 78,262.61
  4. Step 4: Simplify right side
    128,563.61x = 13,885,176,462.18
  5. Step 5: Solve for x
    x = 13,885,176,462.18/128,563.61
  6. Step 6: Final answer
    x = 108,002.39

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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.