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Finding the Fourth Proportional to 528,160, 728,860.80 and 289,690.88

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Solution

The fourth proportional to 528,160, 728,860.80 and 289,690.88 is: 399,773.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,160 : 728,860.80 = 289,690.88 : x
  2. Step 2: Convert to fraction form
    528,160/728,860.80 = 289,690.88/x
  3. Step 3: Cross multiply
    528,160x = 728,860.80 × 289,690.88
  4. Step 4: Simplify right side
    528,160x = 211,144,326,549.50
  5. Step 5: Solve for x
    x = 211,144,326,549.50/528,160
  6. Step 6: Final answer
    x = 399,773.41

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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.