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Finding the Fourth Proportional to 390,639.12, 585,355.59 and 263,782.20

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Solution

The fourth proportional to 390,639.12, 585,355.59 and 263,782.20 is: 395,266.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,639.12 : 585,355.59 = 263,782.20 : x
  2. Step 2: Convert to fraction form
    390,639.12/585,355.59 = 263,782.20/x
  3. Step 3: Cross multiply
    390,639.12x = 585,355.59 × 263,782.20
  4. Step 4: Simplify right side
    390,639.12x = 154,406,385,312.50
  5. Step 5: Solve for x
    x = 154,406,385,312.50/390,639.12
  6. Step 6: Final answer
    x = 395,266.06

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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.