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Finding the Fourth Proportional to 1,875.18, 2,813.16 and 642.30

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Solution

The fourth proportional to 1,875.18, 2,813.16 and 642.30 is: 963.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,875.18 : 2,813.16 = 642.30 : x
  2. Step 2: Convert to fraction form
    1,875.18/2,813.16 = 642.30/x
  3. Step 3: Cross multiply
    1,875.18x = 2,813.16 × 642.30
  4. Step 4: Simplify right side
    1,875.18x = 1,806,892.67
  5. Step 5: Solve for x
    x = 1,806,892.67/1,875.18
  6. Step 6: Final answer
    x = 963.58

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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.