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Finding the Fourth Proportional to 84,970.72, 127,428.79 and 28,031.83

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Solution

The fourth proportional to 84,970.72, 127,428.79 and 28,031.83 is: 42,038.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,970.72 : 127,428.79 = 28,031.83 : x
  2. Step 2: Convert to fraction form
    84,970.72/127,428.79 = 28,031.83/x
  3. Step 3: Cross multiply
    84,970.72x = 127,428.79 × 28,031.83
  4. Step 4: Simplify right side
    84,970.72x = 3,572,061,541.24
  5. Step 5: Solve for x
    x = 3,572,061,541.24/84,970.72
  6. Step 6: Final answer
    x = 42,038.74

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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.