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Finding the Fourth Proportional to 84,688.94, 126,987.96 and 28,510.40

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Solution

The fourth proportional to 84,688.94, 126,987.96 and 28,510.40 is: 42,750.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,688.94 : 126,987.96 = 28,510.40 : x
  2. Step 2: Convert to fraction form
    84,688.94/126,987.96 = 28,510.40/x
  3. Step 3: Cross multiply
    84,688.94x = 126,987.96 × 28,510.40
  4. Step 4: Simplify right side
    84,688.94x = 3,620,477,534.78
  5. Step 5: Solve for x
    x = 3,620,477,534.78/84,688.94
  6. Step 6: Final answer
    x = 42,750.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.