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Finding the Fourth Proportional to 1,355, 1,870.38 and 803

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Solution

The fourth proportional to 1,355, 1,870.38 and 803 is: 1,108.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355 : 1,870.38 = 803 : x
  2. Step 2: Convert to fraction form
    1,355/1,870.38 = 803/x
  3. Step 3: Cross multiply
    1,355x = 1,870.38 × 803
  4. Step 4: Simplify right side
    1,355x = 1,501,915.14
  5. Step 5: Solve for x
    x = 1,501,915.14/1,355
  6. Step 6: Final answer
    x = 1,108.42

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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.