Home / 428,985.95-590,864.19-319,740.20

Finding the Fourth Proportional to 428,985.95, 590,864.19 and 319,740.20

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Solution

The fourth proportional to 428,985.95, 590,864.19 and 319,740.20 is: 440,394.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,985.95 : 590,864.19 = 319,740.20 : x
  2. Step 2: Convert to fraction form
    428,985.95/590,864.19 = 319,740.20/x
  3. Step 3: Cross multiply
    428,985.95x = 590,864.19 × 319,740.20
  4. Step 4: Simplify right side
    428,985.95x = 188,923,031,329.12
  5. Step 5: Solve for x
    x = 188,923,031,329.12/428,985.95
  6. Step 6: Final answer
    x = 440,394.45

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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.