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Finding the Fourth Proportional to 159,420.47, 219,995.76 and 86,821.72

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Solution

The fourth proportional to 159,420.47, 219,995.76 and 86,821.72 is: 119,811.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    159,420.47 : 219,995.76 = 86,821.72 : x
  2. Step 2: Convert to fraction form
    159,420.47/219,995.76 = 86,821.72/x
  3. Step 3: Cross multiply
    159,420.47x = 219,995.76 × 86,821.72
  4. Step 4: Simplify right side
    159,420.47x = 19,100,411,288.98
  5. Step 5: Solve for x
    x = 19,100,411,288.98/159,420.47
  6. Step 6: Final answer
    x = 119,811.53

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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.