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Finding the Fourth Proportional to 390,547.63, 585,064.87 and 221,556.77

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Solution

The fourth proportional to 390,547.63, 585,064.87 and 221,556.77 is: 331,905.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,547.63 : 585,064.87 = 221,556.77 : x
  2. Step 2: Convert to fraction form
    390,547.63/585,064.87 = 221,556.77/x
  3. Step 3: Cross multiply
    390,547.63x = 585,064.87 × 221,556.77
  4. Step 4: Simplify right side
    390,547.63x = 129,625,082,798.70
  5. Step 5: Solve for x
    x = 129,625,082,798.70/390,547.63
  6. Step 6: Final answer
    x = 331,905.96

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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.