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Finding the Fourth Proportional to 763.18, 1,140.59 and 556.36

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Solution

The fourth proportional to 763.18, 1,140.59 and 556.36 is: 831.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.18 : 1,140.59 = 556.36 : x
  2. Step 2: Convert to fraction form
    763.18/1,140.59 = 556.36/x
  3. Step 3: Cross multiply
    763.18x = 1,140.59 × 556.36
  4. Step 4: Simplify right side
    763.18x = 634,578.65
  5. Step 5: Solve for x
    x = 634,578.65/763.18
  6. Step 6: Final answer
    x = 831.49

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.