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Finding the Fourth Proportional to 390,345.54, 585,518.51 and 109,862.79

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Solution

The fourth proportional to 390,345.54, 585,518.51 and 109,862.79 is: 164,794.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,345.54 : 585,518.51 = 109,862.79 : x
  2. Step 2: Convert to fraction form
    390,345.54/585,518.51 = 109,862.79/x
  3. Step 3: Cross multiply
    390,345.54x = 585,518.51 × 109,862.79
  4. Step 4: Simplify right side
    390,345.54x = 64,326,697,105.24
  5. Step 5: Solve for x
    x = 64,326,697,105.24/390,345.54
  6. Step 6: Final answer
    x = 164,794.24

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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.