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Finding the Fourth Proportional to 917.48, 1,376.42 and 455.51

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Solution

The fourth proportional to 917.48, 1,376.42 and 455.51 is: 683.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.48 : 1,376.42 = 455.51 : x
  2. Step 2: Convert to fraction form
    917.48/1,376.42 = 455.51/x
  3. Step 3: Cross multiply
    917.48x = 1,376.42 × 455.51
  4. Step 4: Simplify right side
    917.48x = 626,973.07
  5. Step 5: Solve for x
    x = 626,973.07/917.48
  6. Step 6: Final answer
    x = 683.36

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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.