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Finding the Fourth Proportional to 677.80, 1,015.15 and 561.47

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Solution

The fourth proportional to 677.80, 1,015.15 and 561.47 is: 840.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.80 : 1,015.15 = 561.47 : x
  2. Step 2: Convert to fraction form
    677.80/1,015.15 = 561.47/x
  3. Step 3: Cross multiply
    677.80x = 1,015.15 × 561.47
  4. Step 4: Simplify right side
    677.80x = 569,970.84
  5. Step 5: Solve for x
    x = 569,970.84/677.80
  6. Step 6: Final answer
    x = 840.91

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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.