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Finding the Fourth Proportional to 978,520.86, 1,349,785.32 and 615,368.70

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Solution

The fourth proportional to 978,520.86, 1,349,785.32 and 615,368.70 is: 848,848.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,520.86 : 1,349,785.32 = 615,368.70 : x
  2. Step 2: Convert to fraction form
    978,520.86/1,349,785.32 = 615,368.70/x
  3. Step 3: Cross multiply
    978,520.86x = 1,349,785.32 × 615,368.70
  4. Step 4: Simplify right side
    978,520.86x = 830,615,637,647.48
  5. Step 5: Solve for x
    x = 830,615,637,647.48/978,520.86
  6. Step 6: Final answer
    x = 848,848.17

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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.