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Finding the Fourth Proportional to 390,973.34, 539,382.84 and 237,888.80

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Solution

The fourth proportional to 390,973.34, 539,382.84 and 237,888.80 is: 328,188.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,973.34 : 539,382.84 = 237,888.80 : x
  2. Step 2: Convert to fraction form
    390,973.34/539,382.84 = 237,888.80/x
  3. Step 3: Cross multiply
    390,973.34x = 539,382.84 × 237,888.80
  4. Step 4: Simplify right side
    390,973.34x = 128,313,136,548.19
  5. Step 5: Solve for x
    x = 128,313,136,548.19/390,973.34
  6. Step 6: Final answer
    x = 328,188.97

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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.