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Finding the Fourth Proportional to 933.99, 1,389.10 and 915.56

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Solution

The fourth proportional to 933.99, 1,389.10 and 915.56 is: 1,361.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.99 : 1,389.10 = 915.56 : x
  2. Step 2: Convert to fraction form
    933.99/1,389.10 = 915.56/x
  3. Step 3: Cross multiply
    933.99x = 1,389.10 × 915.56
  4. Step 4: Simplify right side
    933.99x = 1,271,799.82
  5. Step 5: Solve for x
    x = 1,271,799.82/933.99
  6. Step 6: Final answer
    x = 1,361.68

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1.5x scale

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.