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Finding the Fourth Proportional to 388,905.70, 583,358.55 and 355,663.30

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Solution

The fourth proportional to 388,905.70, 583,358.55 and 355,663.30 is: 533,494.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,905.70 : 583,358.55 = 355,663.30 : x
  2. Step 2: Convert to fraction form
    388,905.70/583,358.55 = 355,663.30/x
  3. Step 3: Cross multiply
    388,905.70x = 583,358.55 × 355,663.30
  4. Step 4: Simplify right side
    388,905.70x = 207,479,226,976.22
  5. Step 5: Solve for x
    x = 207,479,226,976.22/388,905.70
  6. Step 6: Final answer
    x = 533,494.95

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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.