Home / 1,388.40-1,916.24-1,056.32

Finding the Fourth Proportional to 1,388.40, 1,916.24 and 1,056.32

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Solution

The fourth proportional to 1,388.40, 1,916.24 and 1,056.32 is: 1,457.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.40 : 1,916.24 = 1,056.32 : x
  2. Step 2: Convert to fraction form
    1,388.40/1,916.24 = 1,056.32/x
  3. Step 3: Cross multiply
    1,388.40x = 1,916.24 × 1,056.32
  4. Step 4: Simplify right side
    1,388.40x = 2,024,162.64
  5. Step 5: Solve for x
    x = 2,024,162.64/1,388.40
  6. Step 6: Final answer
    x = 1,457.91

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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.