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Finding the Fourth Proportional to 1,938.61, 2,907.20 and 705.72

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Solution

The fourth proportional to 1,938.61, 2,907.20 and 705.72 is: 1,058.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,938.61 : 2,907.20 = 705.72 : x
  2. Step 2: Convert to fraction form
    1,938.61/2,907.20 = 705.72/x
  3. Step 3: Cross multiply
    1,938.61x = 2,907.20 × 705.72
  4. Step 4: Simplify right side
    1,938.61x = 2,051,669.18
  5. Step 5: Solve for x
    x = 2,051,669.18/1,938.61
  6. Step 6: Final answer
    x = 1,058.32

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1.5x scale

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.