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Finding the Fourth Proportional to 953.69, 1,315.14 and 718.20

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Solution

The fourth proportional to 953.69, 1,315.14 and 718.20 is: 990.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.69 : 1,315.14 = 718.20 : x
  2. Step 2: Convert to fraction form
    953.69/1,315.14 = 718.20/x
  3. Step 3: Cross multiply
    953.69x = 1,315.14 × 718.20
  4. Step 4: Simplify right side
    953.69x = 944,533.55
  5. Step 5: Solve for x
    x = 944,533.55/953.69
  6. Step 6: Final answer
    x = 990.40

Related Problems

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Half scale
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Double scale
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Similar ratio
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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.