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Finding the Fourth Proportional to 390,643.60, 585,965.40 and 95,155.60

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Solution

The fourth proportional to 390,643.60, 585,965.40 and 95,155.60 is: 142,733.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,643.60 : 585,965.40 = 95,155.60 : x
  2. Step 2: Convert to fraction form
    390,643.60/585,965.40 = 95,155.60/x
  3. Step 3: Cross multiply
    390,643.60x = 585,965.40 × 95,155.60
  4. Step 4: Simplify right side
    390,643.60x = 55,757,889,216.24
  5. Step 5: Solve for x
    x = 55,757,889,216.24/390,643.60
  6. Step 6: Final answer
    x = 142,733.40

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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.