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Finding the Fourth Proportional to 955.80, 1,319.08 and 690.14

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Solution

The fourth proportional to 955.80, 1,319.08 and 690.14 is: 952.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.80 : 1,319.08 = 690.14 : x
  2. Step 2: Convert to fraction form
    955.80/1,319.08 = 690.14/x
  3. Step 3: Cross multiply
    955.80x = 1,319.08 × 690.14
  4. Step 4: Simplify right side
    955.80x = 910,349.87
  5. Step 5: Solve for x
    x = 910,349.87/955.80
  6. Step 6: Final answer
    x = 952.45

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Double scale
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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.