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Finding the Fourth Proportional to 390,616.60, 585,809.70 and 153,880.60

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Solution

The fourth proportional to 390,616.60, 585,809.70 and 153,880.60 is: 230,775.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,616.60 : 585,809.70 = 153,880.60 : x
  2. Step 2: Convert to fraction form
    390,616.60/585,809.70 = 153,880.60/x
  3. Step 3: Cross multiply
    390,616.60x = 585,809.70 × 153,880.60
  4. Step 4: Simplify right side
    390,616.60x = 90,144,748,121.82
  5. Step 5: Solve for x
    x = 90,144,748,121.82/390,616.60
  6. Step 6: Final answer
    x = 230,775.52

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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.