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Finding the Fourth Proportional to 1,353.65, 1,865.85 and 980.12

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Solution

The fourth proportional to 1,353.65, 1,865.85 and 980.12 is: 1,350.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,353.65 : 1,865.85 = 980.12 : x
  2. Step 2: Convert to fraction form
    1,353.65/1,865.85 = 980.12/x
  3. Step 3: Cross multiply
    1,353.65x = 1,865.85 × 980.12
  4. Step 4: Simplify right side
    1,353.65x = 1,828,756.90
  5. Step 5: Solve for x
    x = 1,828,756.90/1,353.65
  6. Step 6: Final answer
    x = 1,350.98

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1.5x scale

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.