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Finding the Fourth Proportional to 1,307.61, 1,802.68 and 887.31

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Solution

The fourth proportional to 1,307.61, 1,802.68 and 887.31 is: 1,223.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.61 : 1,802.68 = 887.31 : x
  2. Step 2: Convert to fraction form
    1,307.61/1,802.68 = 887.31/x
  3. Step 3: Cross multiply
    1,307.61x = 1,802.68 × 887.31
  4. Step 4: Simplify right side
    1,307.61x = 1,599,533.77
  5. Step 5: Solve for x
    x = 1,599,533.77/1,307.61
  6. Step 6: Final answer
    x = 1,223.25

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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.