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Finding the Fourth Proportional to 1,430.79, 1,974.96 and 907.53

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Solution

The fourth proportional to 1,430.79, 1,974.96 and 907.53 is: 1,252.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,430.79 : 1,974.96 = 907.53 : x
  2. Step 2: Convert to fraction form
    1,430.79/1,974.96 = 907.53/x
  3. Step 3: Cross multiply
    1,430.79x = 1,974.96 × 907.53
  4. Step 4: Simplify right side
    1,430.79x = 1,792,335.45
  5. Step 5: Solve for x
    x = 1,792,335.45/1,430.79
  6. Step 6: Final answer
    x = 1,252.69

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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.