Home / 712,668.54-983,456.12-390,381.28

Finding the Fourth Proportional to 712,668.54, 983,456.12 and 390,381.28

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Solution

The fourth proportional to 712,668.54, 983,456.12 and 390,381.28 is: 538,711.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,668.54 : 983,456.12 = 390,381.28 : x
  2. Step 2: Convert to fraction form
    712,668.54/983,456.12 = 390,381.28/x
  3. Step 3: Cross multiply
    712,668.54x = 983,456.12 × 390,381.28
  4. Step 4: Simplify right side
    712,668.54x = 383,922,858,949.43
  5. Step 5: Solve for x
    x = 383,922,858,949.43/712,668.54
  6. Step 6: Final answer
    x = 538,711.67

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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.