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Finding the Fourth Proportional to 390,065.40, 583,802.10 and 283,145.40

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Solution

The fourth proportional to 390,065.40, 583,802.10 and 283,145.40 is: 423,777.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,065.40 : 583,802.10 = 283,145.40 : x
  2. Step 2: Convert to fraction form
    390,065.40/583,802.10 = 283,145.40/x
  3. Step 3: Cross multiply
    390,065.40x = 583,802.10 × 283,145.40
  4. Step 4: Simplify right side
    390,065.40x = 165,300,879,125.34
  5. Step 5: Solve for x
    x = 165,300,879,125.34/390,065.40
  6. Step 6: Final answer
    x = 423,777.34

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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.