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Finding the Fourth Proportional to 387,686.40, 581,606.40 and 325,785.60

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Solution

The fourth proportional to 387,686.40, 581,606.40 and 325,785.60 is: 488,742.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,686.40 : 581,606.40 = 325,785.60 : x
  2. Step 2: Convert to fraction form
    387,686.40/581,606.40 = 325,785.60/x
  3. Step 3: Cross multiply
    387,686.40x = 581,606.40 × 325,785.60
  4. Step 4: Simplify right side
    387,686.40x = 189,478,989,987.84
  5. Step 5: Solve for x
    x = 189,478,989,987.84/387,686.40
  6. Step 6: Final answer
    x = 488,742.94

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.