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Finding the Fourth Proportional to 390,045.60, 584,193.60 and 320,061.60

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Solution

The fourth proportional to 390,045.60, 584,193.60 and 320,061.60 is: 479,374.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,045.60 : 584,193.60 = 320,061.60 : x
  2. Step 2: Convert to fraction form
    390,045.60/584,193.60 = 320,061.60/x
  3. Step 3: Cross multiply
    390,045.60x = 584,193.60 × 320,061.60
  4. Step 4: Simplify right side
    390,045.60x = 186,977,938,325.76
  5. Step 5: Solve for x
    x = 186,977,938,325.76/390,045.60
  6. Step 6: Final answer
    x = 479,374.56

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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.