Home / 390,505.04-585,088.80-213,136.52

Finding the Fourth Proportional to 390,505.04, 585,088.80 and 213,136.52

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Solution

The fourth proportional to 390,505.04, 585,088.80 and 213,136.52 is: 319,339.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,505.04 : 585,088.80 = 213,136.52 : x
  2. Step 2: Convert to fraction form
    390,505.04/585,088.80 = 213,136.52/x
  3. Step 3: Cross multiply
    390,505.04x = 585,088.80 × 213,136.52
  4. Step 4: Simplify right side
    390,505.04x = 124,703,790,722.98
  5. Step 5: Solve for x
    x = 124,703,790,722.98/390,505.04
  6. Step 6: Final answer
    x = 319,339.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.