Home / 128,985.69-177,990.48-72,386.13

Finding the Fourth Proportional to 128,985.69, 177,990.48 and 72,386.13

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Solution

The fourth proportional to 128,985.69, 177,990.48 and 72,386.13 is: 99,887.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,985.69 : 177,990.48 = 72,386.13 : x
  2. Step 2: Convert to fraction form
    128,985.69/177,990.48 = 72,386.13/x
  3. Step 3: Cross multiply
    128,985.69x = 177,990.48 × 72,386.13
  4. Step 4: Simplify right side
    128,985.69x = 12,884,042,024.04
  5. Step 5: Solve for x
    x = 12,884,042,024.04/128,985.69
  6. Step 6: Final answer
    x = 99,887.38

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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.