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Finding the Fourth Proportional to 887.61, 1,224.21 and 651.45

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Solution

The fourth proportional to 887.61, 1,224.21 and 651.45 is: 898.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.61 : 1,224.21 = 651.45 : x
  2. Step 2: Convert to fraction form
    887.61/1,224.21 = 651.45/x
  3. Step 3: Cross multiply
    887.61x = 1,224.21 × 651.45
  4. Step 4: Simplify right side
    887.61x = 797,515.20
  5. Step 5: Solve for x
    x = 797,515.20/887.61
  6. Step 6: Final answer
    x = 898.50

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1.5x scale

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.