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Finding the Fourth Proportional to 1,390.71, 1,918.76 and 893.93

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Solution

The fourth proportional to 1,390.71, 1,918.76 and 893.93 is: 1,233.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.71 : 1,918.76 = 893.93 : x
  2. Step 2: Convert to fraction form
    1,390.71/1,918.76 = 893.93/x
  3. Step 3: Cross multiply
    1,390.71x = 1,918.76 × 893.93
  4. Step 4: Simplify right side
    1,390.71x = 1,715,229.77
  5. Step 5: Solve for x
    x = 1,715,229.77/1,390.71
  6. Step 6: Final answer
    x = 1,233.35

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1.5x scale

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.