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Finding the Fourth Proportional to 390,291.71, 585,038.76 and 221,455.35

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Solution

The fourth proportional to 390,291.71, 585,038.76 and 221,455.35 is: 331,956.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,291.71 : 585,038.76 = 221,455.35 : x
  2. Step 2: Convert to fraction form
    390,291.71/585,038.76 = 221,455.35/x
  3. Step 3: Cross multiply
    390,291.71x = 585,038.76 × 221,455.35
  4. Step 4: Simplify right side
    390,291.71x = 129,559,963,359.37
  5. Step 5: Solve for x
    x = 129,559,963,359.37/390,291.71
  6. Step 6: Final answer
    x = 331,956.74

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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.