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Finding the Fourth Proportional to 390,130.60, 585,195.90 and 109,611.40

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Solution

The fourth proportional to 390,130.60, 585,195.90 and 109,611.40 is: 164,417.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,130.60 : 585,195.90 = 109,611.40 : x
  2. Step 2: Convert to fraction form
    390,130.60/585,195.90 = 109,611.40/x
  3. Step 3: Cross multiply
    390,130.60x = 585,195.90 × 109,611.40
  4. Step 4: Simplify right side
    390,130.60x = 64,144,141,873.26
  5. Step 5: Solve for x
    x = 64,144,141,873.26/390,130.60
  6. Step 6: Final answer
    x = 164,417.10

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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.