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Finding the Fourth Proportional to 1,345.89, 2,017.79 and 642.75

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Solution

The fourth proportional to 1,345.89, 2,017.79 and 642.75 is: 963.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,345.89 : 2,017.79 = 642.75 : x
  2. Step 2: Convert to fraction form
    1,345.89/2,017.79 = 642.75/x
  3. Step 3: Cross multiply
    1,345.89x = 2,017.79 × 642.75
  4. Step 4: Simplify right side
    1,345.89x = 1,296,934.52
  5. Step 5: Solve for x
    x = 1,296,934.52/1,345.89
  6. Step 6: Final answer
    x = 963.63

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1.5x scale

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.