Home / 78,840.18-118,275.85-28,920.74

Finding the Fourth Proportional to 78,840.18, 118,275.85 and 28,920.74

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Solution

The fourth proportional to 78,840.18, 118,275.85 and 28,920.74 is: 43,386.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,840.18 : 118,275.85 = 28,920.74 : x
  2. Step 2: Convert to fraction form
    78,840.18/118,275.85 = 28,920.74/x
  3. Step 3: Cross multiply
    78,840.18x = 118,275.85 × 28,920.74
  4. Step 4: Simplify right side
    78,840.18x = 3,420,624,665.84
  5. Step 5: Solve for x
    x = 3,420,624,665.84/78,840.18
  6. Step 6: Final answer
    x = 43,386.82

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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.