Home / 390,505.02-585,088.80-213,136.50

Finding the Fourth Proportional to 390,505.02, 585,088.80 and 213,136.50

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Solution

The fourth proportional to 390,505.02, 585,088.80 and 213,136.50 is: 319,339.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,505.02 : 585,088.80 = 213,136.50 : x
  2. Step 2: Convert to fraction form
    390,505.02/585,088.80 = 213,136.50/x
  3. Step 3: Cross multiply
    390,505.02x = 585,088.80 × 213,136.50
  4. Step 4: Simplify right side
    390,505.02x = 124,703,779,021.20
  5. Step 5: Solve for x
    x = 124,703,779,021.20/390,505.02
  6. Step 6: Final answer
    x = 319,339.76

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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.