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Finding the Fourth Proportional to 765.61, 1,056.50 and 470.77

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Solution

The fourth proportional to 765.61, 1,056.50 and 470.77 is: 649.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.61 : 1,056.50 = 470.77 : x
  2. Step 2: Convert to fraction form
    765.61/1,056.50 = 470.77/x
  3. Step 3: Cross multiply
    765.61x = 1,056.50 × 470.77
  4. Step 4: Simplify right side
    765.61x = 497,368.51
  5. Step 5: Solve for x
    x = 497,368.51/765.61
  6. Step 6: Final answer
    x = 649.64

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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.