Home / 712,569.18-983,310.39-390,280.71

Finding the Fourth Proportional to 712,569.18, 983,310.39 and 390,280.71

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Solution

The fourth proportional to 712,569.18, 983,310.39 and 390,280.71 is: 538,568.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,569.18 : 983,310.39 = 390,280.71 : x
  2. Step 2: Convert to fraction form
    712,569.18/983,310.39 = 390,280.71/x
  3. Step 3: Cross multiply
    712,569.18x = 983,310.39 × 390,280.71
  4. Step 4: Simplify right side
    712,569.18x = 383,767,077,159.58
  5. Step 5: Solve for x
    x = 383,767,077,159.58/712,569.18
  6. Step 6: Final answer
    x = 538,568.17

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Double scale
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Similar ratio
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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.