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Finding the Fourth Proportional to 389,973.60, 584,085.60 and 319,989.60

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Solution

The fourth proportional to 389,973.60, 584,085.60 and 319,989.60 is: 479,266.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,973.60 : 584,085.60 = 319,989.60 : x
  2. Step 2: Convert to fraction form
    389,973.60/584,085.60 = 319,989.60/x
  3. Step 3: Cross multiply
    389,973.60x = 584,085.60 × 319,989.60
  4. Step 4: Simplify right side
    389,973.60x = 186,901,317,509.76
  5. Step 5: Solve for x
    x = 186,901,317,509.76/389,973.60
  6. Step 6: Final answer
    x = 479,266.59

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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.