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Finding the Fourth Proportional to 978,009.64, 1,349,652.40 and 548,289.86

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Solution

The fourth proportional to 978,009.64, 1,349,652.40 and 548,289.86 is: 756,639.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,009.64 : 1,349,652.40 = 548,289.86 : x
  2. Step 2: Convert to fraction form
    978,009.64/1,349,652.40 = 548,289.86/x
  3. Step 3: Cross multiply
    978,009.64x = 1,349,652.40 × 548,289.86
  4. Step 4: Simplify right side
    978,009.64x = 740,000,726,459.54
  5. Step 5: Solve for x
    x = 740,000,726,459.54/978,009.64
  6. Step 6: Final answer
    x = 756,639.50

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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.