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Finding the Fourth Proportional to 103,612.64, 142,985.66 and 61,173.90

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Solution

The fourth proportional to 103,612.64, 142,985.66 and 61,173.90 is: 84,420.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,612.64 : 142,985.66 = 61,173.90 : x
  2. Step 2: Convert to fraction form
    103,612.64/142,985.66 = 61,173.90/x
  3. Step 3: Cross multiply
    103,612.64x = 142,985.66 × 61,173.90
  4. Step 4: Simplify right side
    103,612.64x = 8,746,990,160.40
  5. Step 5: Solve for x
    x = 8,746,990,160.40/103,612.64
  6. Step 6: Final answer
    x = 84,420.11

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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.