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Finding the Fourth Proportional to 1,417.08, 2,125.46 and 391

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Solution

The fourth proportional to 1,417.08, 2,125.46 and 391 is: 586.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,417.08 : 2,125.46 = 391 : x
  2. Step 2: Convert to fraction form
    1,417.08/2,125.46 = 391/x
  3. Step 3: Cross multiply
    1,417.08x = 2,125.46 × 391
  4. Step 4: Simplify right side
    1,417.08x = 831,054.86
  5. Step 5: Solve for x
    x = 831,054.86/1,417.08
  6. Step 6: Final answer
    x = 586.46

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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.