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Finding the Fourth Proportional to 653.82, 978.66 and 555.40

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Solution

The fourth proportional to 653.82, 978.66 and 555.40 is: 831.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.82 : 978.66 = 555.40 : x
  2. Step 2: Convert to fraction form
    653.82/978.66 = 555.40/x
  3. Step 3: Cross multiply
    653.82x = 978.66 × 555.40
  4. Step 4: Simplify right side
    653.82x = 543,547.76
  5. Step 5: Solve for x
    x = 543,547.76/653.82
  6. Step 6: Final answer
    x = 831.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.