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Finding the Fourth Proportional to 983.75, 1,353.51 and 959.45

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Solution

The fourth proportional to 983.75, 1,353.51 and 959.45 is: 1,320.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.75 : 1,353.51 = 959.45 : x
  2. Step 2: Convert to fraction form
    983.75/1,353.51 = 959.45/x
  3. Step 3: Cross multiply
    983.75x = 1,353.51 × 959.45
  4. Step 4: Simplify right side
    983.75x = 1,298,618.40
  5. Step 5: Solve for x
    x = 1,298,618.40/983.75
  6. Step 6: Final answer
    x = 1,320.08

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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.