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Finding the Fourth Proportional to 954.18, 1,316.70 and 561.15

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Solution

The fourth proportional to 954.18, 1,316.70 and 561.15 is: 774.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    954.18 : 1,316.70 = 561.15 : x
  2. Step 2: Convert to fraction form
    954.18/1,316.70 = 561.15/x
  3. Step 3: Cross multiply
    954.18x = 1,316.70 × 561.15
  4. Step 4: Simplify right side
    954.18x = 738,866.21
  5. Step 5: Solve for x
    x = 738,866.21/954.18
  6. Step 6: Final answer
    x = 774.35

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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.