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Finding the Fourth Proportional to 802.40, 1,106.68 and 678.40

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Solution

The fourth proportional to 802.40, 1,106.68 and 678.40 is: 935.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    802.40 : 1,106.68 = 678.40 : x
  2. Step 2: Convert to fraction form
    802.40/1,106.68 = 678.40/x
  3. Step 3: Cross multiply
    802.40x = 1,106.68 × 678.40
  4. Step 4: Simplify right side
    802.40x = 750,771.71
  5. Step 5: Solve for x
    x = 750,771.71/802.40
  6. Step 6: Final answer
    x = 935.66

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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.