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Finding the Fourth Proportional to 875.43, 1,307.93 and 639.99

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Solution

The fourth proportional to 875.43, 1,307.93 and 639.99 is: 956.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.43 : 1,307.93 = 639.99 : x
  2. Step 2: Convert to fraction form
    875.43/1,307.93 = 639.99/x
  3. Step 3: Cross multiply
    875.43x = 1,307.93 × 639.99
  4. Step 4: Simplify right side
    875.43x = 837,058.92
  5. Step 5: Solve for x
    x = 837,058.92/875.43
  6. Step 6: Final answer
    x = 956.17

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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.