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Finding the Fourth Proportional to 978,186.84, 1,349,401.02 and 638,853.72

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Solution

The fourth proportional to 978,186.84, 1,349,401.02 and 638,853.72 is: 881,293.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,186.84 : 1,349,401.02 = 638,853.72 : x
  2. Step 2: Convert to fraction form
    978,186.84/1,349,401.02 = 638,853.72/x
  3. Step 3: Cross multiply
    978,186.84x = 1,349,401.02 × 638,853.72
  4. Step 4: Simplify right side
    978,186.84x = 862,069,861,398.79
  5. Step 5: Solve for x
    x = 862,069,861,398.79/978,186.84
  6. Step 6: Final answer
    x = 881,293.66

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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.