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Finding the Fourth Proportional to 1,056.40, 1,457.31 and 835

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Solution

The fourth proportional to 1,056.40, 1,457.31 and 835 is: 1,151.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,056.40 : 1,457.31 = 835 : x
  2. Step 2: Convert to fraction form
    1,056.40/1,457.31 = 835/x
  3. Step 3: Cross multiply
    1,056.40x = 1,457.31 × 835
  4. Step 4: Simplify right side
    1,056.40x = 1,216,853.85
  5. Step 5: Solve for x
    x = 1,216,853.85/1,056.40
  6. Step 6: Final answer
    x = 1,151.89

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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.