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Finding the Fourth Proportional to 720,009.91, 993,603.34 and 393,318.96

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Solution

The fourth proportional to 720,009.91, 993,603.34 and 393,318.96 is: 542,774.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,009.91 : 993,603.34 = 393,318.96 : x
  2. Step 2: Convert to fraction form
    720,009.91/993,603.34 = 393,318.96/x
  3. Step 3: Cross multiply
    720,009.91x = 993,603.34 × 393,318.96
  4. Step 4: Simplify right side
    720,009.91x = 390,803,032,341.33
  5. Step 5: Solve for x
    x = 390,803,032,341.33/720,009.91
  6. Step 6: Final answer
    x = 542,774.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.