Home / 712,815.21-983,685.78-390,545.91

Finding the Fourth Proportional to 712,815.21, 983,685.78 and 390,545.91

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Solution

The fourth proportional to 712,815.21, 983,685.78 and 390,545.91 is: 538,953.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,815.21 : 983,685.78 = 390,545.91 : x
  2. Step 2: Convert to fraction form
    712,815.21/983,685.78 = 390,545.91/x
  3. Step 3: Cross multiply
    712,815.21x = 983,685.78 × 390,545.91
  4. Step 4: Simplify right side
    712,815.21x = 384,174,458,104.16
  5. Step 5: Solve for x
    x = 384,174,458,104.16/712,815.21
  6. Step 6: Final answer
    x = 538,953.79

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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.