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Finding the Fourth Proportional to 390,345.35, 585,119.16 and 221,509.13

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Solution

The fourth proportional to 390,345.35, 585,119.16 and 221,509.13 is: 332,037.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,345.35 : 585,119.16 = 221,509.13 : x
  2. Step 2: Convert to fraction form
    390,345.35/585,119.16 = 221,509.13/x
  3. Step 3: Cross multiply
    390,345.35x = 585,119.16 × 221,509.13
  4. Step 4: Simplify right side
    390,345.35x = 129,609,233,152.34
  5. Step 5: Solve for x
    x = 129,609,233,152.34/390,345.35
  6. Step 6: Final answer
    x = 332,037.35

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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.