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Finding the Fourth Proportional to 978,390.90, 1,349,856.54 and 591,061.32

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Solution

The fourth proportional to 978,390.90, 1,349,856.54 and 591,061.32 is: 815,469.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,390.90 : 1,349,856.54 = 591,061.32 : x
  2. Step 2: Convert to fraction form
    978,390.90/1,349,856.54 = 591,061.32/x
  3. Step 3: Cross multiply
    978,390.90x = 1,349,856.54 × 591,061.32
  4. Step 4: Simplify right side
    978,390.90x = 797,847,988,343.03
  5. Step 5: Solve for x
    x = 797,847,988,343.03/978,390.90
  6. Step 6: Final answer
    x = 815,469.55

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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.