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Finding the Fourth Proportional to 978,255.78, 1,349,421.03 and 615,104.70

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Solution

The fourth proportional to 978,255.78, 1,349,421.03 and 615,104.70 is: 848,484.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,255.78 : 1,349,421.03 = 615,104.70 : x
  2. Step 2: Convert to fraction form
    978,255.78/1,349,421.03 = 615,104.70/x
  3. Step 3: Cross multiply
    978,255.78x = 1,349,421.03 × 615,104.70
  4. Step 4: Simplify right side
    978,255.78x = 830,035,217,831.84
  5. Step 5: Solve for x
    x = 830,035,217,831.84/978,255.78
  6. Step 6: Final answer
    x = 848,484.86

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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.