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Finding the Fourth Proportional to 953.01, 1,315.05 and 638.63

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Solution

The fourth proportional to 953.01, 1,315.05 and 638.63 is: 881.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.01 : 1,315.05 = 638.63 : x
  2. Step 2: Convert to fraction form
    953.01/1,315.05 = 638.63/x
  3. Step 3: Cross multiply
    953.01x = 1,315.05 × 638.63
  4. Step 4: Simplify right side
    953.01x = 839,823.81
  5. Step 5: Solve for x
    x = 839,823.81/953.01
  6. Step 6: Final answer
    x = 881.23

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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.