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Finding the Fourth Proportional to 935.10, 1,290.56 and 686.51

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Solution

The fourth proportional to 935.10, 1,290.56 and 686.51 is: 947.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.10 : 1,290.56 = 686.51 : x
  2. Step 2: Convert to fraction form
    935.10/1,290.56 = 686.51/x
  3. Step 3: Cross multiply
    935.10x = 1,290.56 × 686.51
  4. Step 4: Simplify right side
    935.10x = 885,972.46
  5. Step 5: Solve for x
    x = 885,972.46/935.10
  6. Step 6: Final answer
    x = 947.46

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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.