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Finding the Fourth Proportional to 712,842.82, 983,723.07 and 390,565.12

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Solution

The fourth proportional to 712,842.82, 983,723.07 and 390,565.12 is: 538,979.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,842.82 : 983,723.07 = 390,565.12 : x
  2. Step 2: Convert to fraction form
    712,842.82/983,723.07 = 390,565.12/x
  3. Step 3: Cross multiply
    712,842.82x = 983,723.07 × 390,565.12
  4. Step 4: Simplify right side
    712,842.82x = 384,207,918,881.32
  5. Step 5: Solve for x
    x = 384,207,918,881.32/712,842.82
  6. Step 6: Final answer
    x = 538,979.85

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1.5x scale

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.