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Finding the Fourth Proportional to 128,592.90, 177,417 and 83,305.80

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Solution

The fourth proportional to 128,592.90, 177,417 and 83,305.80 is: 114,935.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,592.90 : 177,417 = 83,305.80 : x
  2. Step 2: Convert to fraction form
    128,592.90/177,417 = 83,305.80/x
  3. Step 3: Cross multiply
    128,592.90x = 177,417 × 83,305.80
  4. Step 4: Simplify right side
    128,592.90x = 14,779,865,118.60
  5. Step 5: Solve for x
    x = 14,779,865,118.60/128,592.90
  6. Step 6: Final answer
    x = 114,935.31

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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.