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Finding the Fourth Proportional to 672,978.51, 928,687.68 and 400,905.48

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Solution

The fourth proportional to 672,978.51, 928,687.68 and 400,905.48 is: 553,236.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    672,978.51 : 928,687.68 = 400,905.48 : x
  2. Step 2: Convert to fraction form
    672,978.51/928,687.68 = 400,905.48/x
  3. Step 3: Cross multiply
    672,978.51x = 928,687.68 × 400,905.48
  4. Step 4: Simplify right side
    672,978.51x = 372,315,983,603.07
  5. Step 5: Solve for x
    x = 372,315,983,603.07/672,978.51
  6. Step 6: Final answer
    x = 553,236.07

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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.