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Finding the Fourth Proportional to 978.61, 1,468.32 and 401.89

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Solution

The fourth proportional to 978.61, 1,468.32 and 401.89 is: 603.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.61 : 1,468.32 = 401.89 : x
  2. Step 2: Convert to fraction form
    978.61/1,468.32 = 401.89/x
  3. Step 3: Cross multiply
    978.61x = 1,468.32 × 401.89
  4. Step 4: Simplify right side
    978.61x = 590,103.12
  5. Step 5: Solve for x
    x = 590,103.12/978.61
  6. Step 6: Final answer
    x = 603.00

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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.