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Finding the Fourth Proportional to 953.90, 1,316.58 and 561.02

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Solution

The fourth proportional to 953.90, 1,316.58 and 561.02 is: 774.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.90 : 1,316.58 = 561.02 : x
  2. Step 2: Convert to fraction form
    953.90/1,316.58 = 561.02/x
  3. Step 3: Cross multiply
    953.90x = 1,316.58 × 561.02
  4. Step 4: Simplify right side
    953.90x = 738,627.71
  5. Step 5: Solve for x
    x = 738,627.71/953.90
  6. Step 6: Final answer
    x = 774.32

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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.