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Finding the Fourth Proportional to 954.10, 1,315.80 and 622.20

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Solution

The fourth proportional to 954.10, 1,315.80 and 622.20 is: 858.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    954.10 : 1,315.80 = 622.20 : x
  2. Step 2: Convert to fraction form
    954.10/1,315.80 = 622.20/x
  3. Step 3: Cross multiply
    954.10x = 1,315.80 × 622.20
  4. Step 4: Simplify right side
    954.10x = 818,690.76
  5. Step 5: Solve for x
    x = 818,690.76/954.10
  6. Step 6: Final answer
    x = 858.08

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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.