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Finding the Fourth Proportional to 86,420.70, 119,315.61 and 70,542.90

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Solution

The fourth proportional to 86,420.70, 119,315.61 and 70,542.90 is: 97,394.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,420.70 : 119,315.61 = 70,542.90 : x
  2. Step 2: Convert to fraction form
    86,420.70/119,315.61 = 70,542.90/x
  3. Step 3: Cross multiply
    86,420.70x = 119,315.61 × 70,542.90
  4. Step 4: Simplify right side
    86,420.70x = 8,416,869,144.67
  5. Step 5: Solve for x
    x = 8,416,869,144.67/86,420.70
  6. Step 6: Final answer
    x = 97,394.13

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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.