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Finding the Fourth Proportional to 978,261.78, 1,349,429.31 and 615,110.70

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Solution

The fourth proportional to 978,261.78, 1,349,429.31 and 615,110.70 is: 848,493.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,261.78 : 1,349,429.31 = 615,110.70 : x
  2. Step 2: Convert to fraction form
    978,261.78/1,349,429.31 = 615,110.70/x
  3. Step 3: Cross multiply
    978,261.78x = 1,349,429.31 × 615,110.70
  4. Step 4: Simplify right side
    978,261.78x = 830,048,407,474.62
  5. Step 5: Solve for x
    x = 830,048,407,474.62/978,261.78
  6. Step 6: Final answer
    x = 848,493.14

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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.