Home / 78,718.30-118,000.65-70,423.90

Finding the Fourth Proportional to 78,718.30, 118,000.65 and 70,423.90

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Solution

The fourth proportional to 78,718.30, 118,000.65 and 70,423.90 is: 105,567.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,718.30 : 118,000.65 = 70,423.90 : x
  2. Step 2: Convert to fraction form
    78,718.30/118,000.65 = 70,423.90/x
  3. Step 3: Cross multiply
    78,718.30x = 118,000.65 × 70,423.90
  4. Step 4: Simplify right side
    78,718.30x = 8,310,065,975.54
  5. Step 5: Solve for x
    x = 8,310,065,975.54/78,718.30
  6. Step 6: Final answer
    x = 105,567.14

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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.