Home / 128,270.40-177,012.64-71,681.76

Finding the Fourth Proportional to 128,270.40, 177,012.64 and 71,681.76

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Solution

The fourth proportional to 128,270.40, 177,012.64 and 71,681.76 is: 98,920.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,270.40 : 177,012.64 = 71,681.76 : x
  2. Step 2: Convert to fraction form
    128,270.40/177,012.64 = 71,681.76/x
  3. Step 3: Cross multiply
    128,270.40x = 177,012.64 × 71,681.76
  4. Step 4: Simplify right side
    128,270.40x = 12,688,577,577.45
  5. Step 5: Solve for x
    x = 12,688,577,577.45/128,270.40
  6. Step 6: Final answer
    x = 98,920.54

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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.