Home / 128,931.81-177,928.98-72,347.37

Finding the Fourth Proportional to 128,931.81, 177,928.98 and 72,347.37

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Solution

The fourth proportional to 128,931.81, 177,928.98 and 72,347.37 is: 99,841.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,931.81 : 177,928.98 = 72,347.37 : x
  2. Step 2: Convert to fraction form
    128,931.81/177,928.98 = 72,347.37/x
  3. Step 3: Cross multiply
    128,931.81x = 177,928.98 × 72,347.37
  4. Step 4: Simplify right side
    128,931.81x = 12,872,693,749.78
  5. Step 5: Solve for x
    x = 12,872,693,749.78/128,931.81
  6. Step 6: Final answer
    x = 99,841.10

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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.