Home / 128,485.20-177,314.52-71,895.36

Finding the Fourth Proportional to 128,485.20, 177,314.52 and 71,895.36

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Solution

The fourth proportional to 128,485.20, 177,314.52 and 71,895.36 is: 99,218.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,485.20 : 177,314.52 = 71,895.36 : x
  2. Step 2: Convert to fraction form
    128,485.20/177,314.52 = 71,895.36/x
  3. Step 3: Cross multiply
    128,485.20x = 177,314.52 × 71,895.36
  4. Step 4: Simplify right side
    128,485.20x = 12,748,091,248.63
  5. Step 5: Solve for x
    x = 12,748,091,248.63/128,485.20
  6. Step 6: Final answer
    x = 99,218.36

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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.