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Finding the Fourth Proportional to 390,312.72, 585,070.25 and 221,476.37

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Solution

The fourth proportional to 390,312.72, 585,070.25 and 221,476.37 is: 331,988.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,312.72 : 585,070.25 = 221,476.37 : x
  2. Step 2: Convert to fraction form
    390,312.72/585,070.25 = 221,476.37/x
  3. Step 3: Cross multiply
    390,312.72x = 585,070.25 × 221,476.37
  4. Step 4: Simplify right side
    390,312.72x = 129,579,231,132.26
  5. Step 5: Solve for x
    x = 129,579,231,132.26/390,312.72
  6. Step 6: Final answer
    x = 331,988.24

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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.