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Finding the Fourth Proportional to 712,696.76, 983,521.70 and 390,418.31

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Solution

The fourth proportional to 712,696.76, 983,521.70 and 390,418.31 is: 538,777.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,696.76 : 983,521.70 = 390,418.31 : x
  2. Step 2: Convert to fraction form
    712,696.76/983,521.70 = 390,418.31/x
  3. Step 3: Cross multiply
    712,696.76x = 983,521.70 × 390,418.31
  4. Step 4: Simplify right side
    712,696.76x = 383,984,873,092.63
  5. Step 5: Solve for x
    x = 383,984,873,092.63/712,696.76
  6. Step 6: Final answer
    x = 538,777.36

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Double scale
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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.