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Finding the Fourth Proportional to 712,696.89, 983,521.97 and 390,418.60

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Solution

The fourth proportional to 712,696.89, 983,521.97 and 390,418.60 is: 538,777.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,696.89 : 983,521.97 = 390,418.60 : x
  2. Step 2: Convert to fraction form
    712,696.89/983,521.97 = 390,418.60/x
  3. Step 3: Cross multiply
    712,696.89x = 983,521.97 × 390,418.60
  4. Step 4: Simplify right side
    712,696.89x = 383,985,270,596.64
  5. Step 5: Solve for x
    x = 383,985,270,596.64/712,696.89
  6. Step 6: Final answer
    x = 538,777.81

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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.