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Finding the Fourth Proportional to 948.16, 1,308.54 and 686.80

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Solution

The fourth proportional to 948.16, 1,308.54 and 686.80 is: 947.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.16 : 1,308.54 = 686.80 : x
  2. Step 2: Convert to fraction form
    948.16/1,308.54 = 686.80/x
  3. Step 3: Cross multiply
    948.16x = 1,308.54 × 686.80
  4. Step 4: Simplify right side
    948.16x = 898,705.27
  5. Step 5: Solve for x
    x = 898,705.27/948.16
  6. Step 6: Final answer
    x = 947.84

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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.