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Finding the Fourth Proportional to 926.53, 1,390.16 and 561.58

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Solution

The fourth proportional to 926.53, 1,390.16 and 561.58 is: 842.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.53 : 1,390.16 = 561.58 : x
  2. Step 2: Convert to fraction form
    926.53/1,390.16 = 561.58/x
  3. Step 3: Cross multiply
    926.53x = 1,390.16 × 561.58
  4. Step 4: Simplify right side
    926.53x = 780,686.05
  5. Step 5: Solve for x
    x = 780,686.05/926.53
  6. Step 6: Final answer
    x = 842.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.