Home / 77,111.10-115,666.65-72,518.40

Finding the Fourth Proportional to 77,111.10, 115,666.65 and 72,518.40

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Solution

The fourth proportional to 77,111.10, 115,666.65 and 72,518.40 is: 108,777.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,111.10 : 115,666.65 = 72,518.40 : x
  2. Step 2: Convert to fraction form
    77,111.10/115,666.65 = 72,518.40/x
  3. Step 3: Cross multiply
    77,111.10x = 115,666.65 × 72,518.40
  4. Step 4: Simplify right side
    77,111.10x = 8,387,960,391.36
  5. Step 5: Solve for x
    x = 8,387,960,391.36/77,111.10
  6. Step 6: Final answer
    x = 108,777.60

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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.