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Finding the Fourth Proportional to 86,421.70, 119,316.99 and 70,543.90

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Solution

The fourth proportional to 86,421.70, 119,316.99 and 70,543.90 is: 97,395.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,421.70 : 119,316.99 = 70,543.90 : x
  2. Step 2: Convert to fraction form
    86,421.70/119,316.99 = 70,543.90/x
  3. Step 3: Cross multiply
    86,421.70x = 119,316.99 × 70,543.90
  4. Step 4: Simplify right side
    86,421.70x = 8,417,085,810.86
  5. Step 5: Solve for x
    x = 8,417,085,810.86/86,421.70
  6. Step 6: Final answer
    x = 97,395.51

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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.