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Finding the Fourth Proportional to 978,256.78, 1,349,422.41 and 615,105.70

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Solution

The fourth proportional to 978,256.78, 1,349,422.41 and 615,105.70 is: 848,486.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,256.78 : 1,349,422.41 = 615,105.70 : x
  2. Step 2: Convert to fraction form
    978,256.78/1,349,422.41 = 615,105.70/x
  3. Step 3: Cross multiply
    978,256.78x = 1,349,422.41 × 615,105.70
  4. Step 4: Simplify right side
    978,256.78x = 830,037,416,098.74
  5. Step 5: Solve for x
    x = 830,037,416,098.74/978,256.78
  6. Step 6: Final answer
    x = 848,486.24

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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.