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Finding the Fourth Proportional to 652.68, 900.90 and 419.40

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Solution

The fourth proportional to 652.68, 900.90 and 419.40 is: 578.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    652.68 : 900.90 = 419.40 : x
  2. Step 2: Convert to fraction form
    652.68/900.90 = 419.40/x
  3. Step 3: Cross multiply
    652.68x = 900.90 × 419.40
  4. Step 4: Simplify right side
    652.68x = 377,837.46
  5. Step 5: Solve for x
    x = 377,837.46/652.68
  6. Step 6: Final answer
    x = 578.90

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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.