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Finding the Fourth Proportional to 712,728.32, 983,565.48 and 390,450.08

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Solution

The fourth proportional to 712,728.32, 983,565.48 and 390,450.08 is: 538,821.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,728.32 : 983,565.48 = 390,450.08 : x
  2. Step 2: Convert to fraction form
    712,728.32/983,565.48 = 390,450.08/x
  3. Step 3: Cross multiply
    712,728.32x = 983,565.48 × 390,450.08
  4. Step 4: Simplify right side
    712,728.32x = 384,033,220,351.24
  5. Step 5: Solve for x
    x = 384,033,220,351.24/712,728.32
  6. Step 6: Final answer
    x = 538,821.33

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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.