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Finding the Fourth Proportional to 953.64, 1,315.80 and 691.20

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Solution

The fourth proportional to 953.64, 1,315.80 and 691.20 is: 953.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.64 : 1,315.80 = 691.20 : x
  2. Step 2: Convert to fraction form
    953.64/1,315.80 = 691.20/x
  3. Step 3: Cross multiply
    953.64x = 1,315.80 × 691.20
  4. Step 4: Simplify right side
    953.64x = 909,480.96
  5. Step 5: Solve for x
    x = 909,480.96/953.64
  6. Step 6: Final answer
    x = 953.69

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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.