Home / 712,628.80-983,428.16-390,344.28

Finding the Fourth Proportional to 712,628.80, 983,428.16 and 390,344.28

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Solution

The fourth proportional to 712,628.80, 983,428.16 and 390,344.28 is: 538,675.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,628.80 : 983,428.16 = 390,344.28 : x
  2. Step 2: Convert to fraction form
    712,628.80/983,428.16 = 390,344.28/x
  3. Step 3: Cross multiply
    712,628.80x = 983,428.16 × 390,344.28
  4. Step 4: Simplify right side
    712,628.80x = 383,875,557,046.93
  5. Step 5: Solve for x
    x = 383,875,557,046.93/712,628.80
  6. Step 6: Final answer
    x = 538,675.33

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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.