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Finding the Fourth Proportional to 708,816.08, 978,189.81 and 386,543.81

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Solution

The fourth proportional to 708,816.08, 978,189.81 and 386,543.81 is: 533,443.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,816.08 : 978,189.81 = 386,543.81 : x
  2. Step 2: Convert to fraction form
    708,816.08/978,189.81 = 386,543.81/x
  3. Step 3: Cross multiply
    708,816.08x = 978,189.81 × 386,543.81
  4. Step 4: Simplify right side
    708,816.08x = 378,113,216,060.58
  5. Step 5: Solve for x
    x = 378,113,216,060.58/708,816.08
  6. Step 6: Final answer
    x = 533,443.34

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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.