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Finding the Fourth Proportional to 708,804.08, 978,127.80 and 386,520.20

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Solution

The fourth proportional to 708,804.08, 978,127.80 and 386,520.20 is: 533,385.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,804.08 : 978,127.80 = 386,520.20 : x
  2. Step 2: Convert to fraction form
    708,804.08/978,127.80 = 386,520.20/x
  3. Step 3: Cross multiply
    708,804.08x = 978,127.80 × 386,520.20
  4. Step 4: Simplify right side
    708,804.08x = 378,066,152,881.56
  5. Step 5: Solve for x
    x = 378,066,152,881.56/708,804.08
  6. Step 6: Final answer
    x = 533,385.97

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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.